Hereditary Spastic Paraplegia - In depth look at this disease by John K. Fink, M.D., including genetic analysis, clinical features and FAQs. Spastic Paraplegia Foundation - Supports on the upper motor neuron disorders hereditary spastic paraplegia and primary lateral sclerosis. Information about these conditions, disability resources, newsletters, news, announcements, research and support. HSP/FSP Support Group - For people suffering from Familial Spastic Paraplegia. Includes a newsletter, discussion forum, links, and contact details. HSP Research Foundation - Aims to find a cure for hereditary spastic paraplegia, a degenerative, hereditary disease affecting mainly the lower limbs, causing spasticity and severely impairing mobility. Find details about the organization, how to get involved and resources. Hereditary Spastic Paraplegia - HSP information sheet compiled by the National Institute of Neurological Disorders and Stroke. Genetics Home Reference: Spastic Paraplegia Type 4 - Provides information on this condition, the genes involved and sources of further information.